[GTK] Move generated ColorData.cpp, WebKitFontFamilyNames.(cpp|h) build targets into libPlatform
https://bugs.webkit.org/show_bug.cgi?id=115921

Reviewed by Gustavo Noronha Silva.

.: 

* GNUmakefile.am: Add GENSOURCES_PLATFORM, platform_built_sources variables.

Source/Platform: 

* GNUmakefile.am: Move the ANGLE include directories under the new platform_cppflags variable,
adding the DerivedSources/Platform directory. Add the generated sources' build targets to libPlatform
under nodist_libPlatform_la_SOURCES. Add platform_cppflags to the list of libPlatformGtk CPPFLAGS.
Add generation rules for the ColorData.cpp and WebKitFontFamilyNames.(cpp|h) source files, now generated
into the DerivedSources/Platform directory.

Source/WebCore: 

No new tests - no new functionality.

* GNUmakefile.am: Add platform_cppflags to the list of CPPFLAGS for libWebCoreSVG, libWebCore,
libWebCorePlatform, libWebCoreGtk. Remove generation rules for ColorData.cpp and WebKitFontFamilyNames.(cpp|h).
* GNUmakefile.list.am: Include the ColorData.cpp and WebKitFontFamilyNames.(cpp|h) build targers under
platform_built_sources.
* bindings/gobject/GNUmakefile.am: Add platform_cppflags to the list of libWebCoreDOM CPPFLAGS.

Source/WebKit/gtk: 

* GNUmakefile.am: Add platform_cppflags to the list of CPPFLAGS for libwebkit2gtk, libWebCoreGtk2,
libPlatformGtk2 and WebKitPluginProcess.

Source/WebKit2: 

* GNUmakefile.am: Add platform_cppflags to the list of libwebkit2gtk CPPFLAGS.

Tools: 

* GNUmakefile.am: Add platform_cppflags to the list of CPPFLAGS for libWebCoreInternals and DumpRenderTree.
* TestWebKitAPI/GNUmakefile.am: Add platform_cppflags to the list of TestGtk CPPFLAGS.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@150074 268f45cc-cd09-0410-ab3c-d52691b4dbfc